MATLAB cannot write text on images

I have been trying to write text on generated figure using the insertText function. Even when using the following example code given in the Mathworks website:

I = imread('peppers.png');
position =  [1 50; 100 50];
value = [555 pi];   
RGB = insertText(I,position,value,'AnchorPoint','LeftBottom');

I am still getting errors saying:

cell contents reference from a non-cell array object.

Error in listTrueTypeFonts>createFontInfo (line 93)

if ~ismember(fontNameCell{p},fontList) && ~isempty(fontNameCell{p})

I typed in the following to check system font availability on my MATLAB setup:

listTrueTypeFonts

I still get the same error message. But my Windows 10 installation shows several TrueType fonts installed.

Answer 1

[Geoff Hayes]

Debangshu - according to insertText text input argument, your value should be a text character vector or cell array of text character vectors. I think that the MATLAB example is incorrect and that they are missing a step to convert this to a cell array of strings like

 text_str = {'555', num2str(pi)};

or

 text_str = cell(1,length(value));
 for k=1:length(value)
     text_str{k} = num2str(value(k));
 end

 RGB = insertText(I,position, text_str,'AnchorPoint','LeftBottom');

This is similar to what they did in a previous example (converting the numeric array to a cell string array).